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The sensation of being tickled comes from nerve endings in your skin, that when lightly stimulated, send messages to the somatosensory and anterior cingulated cortexes of the brain, which analyze touch and govern pleasant feelings.
Areas of the body that are not often touched by others, such as the underarms and soles of the feet, are the most common ticklish areas.

en.wikipedia.org/wiki/Tickling

Tickling is the act of touching a part of a body in a way that causes involuntary twitching .... While many people assume that other people enjoy tickling, a recent survey of 84 college students indicated that only 32% of respondents enjoy being  ...

lifehacker.com/why-we-are-ticklish-and-how-to-overcome-it-1679545254

Jan 14, 2015 ... But what can you do to not be so ticklish? Some people can hardly be touched without experiencing Gargalesis, but it all comes down to mind ...

science.howstuffworks.com/life/inside-the-mind/emotions/laugh-tickling1.htm

Physiology of Tickling - The physiology of tickling is quite interesting. Learn more about the physiology of tickling at HowStuffWorks.

www.thrillist.com/health/nation/why-are-people-ticklish

Jan 13, 2017 ... Why do people and other animals get ticklish? Is there any purpose for tickling, or being tickled?

www.wsj.com/articles/why-are-some-people-more-ticklish-than-others-1455560232

Feb 15, 2016 ... Wiggly fingers approaching the armpits can elicit giggles from some people. For others, even a feather caressing the toes will bring about no ...

www.latimes.com/science/sciencenow/la-sci-sn-tickling-rats-20161110-story.html

Nov 10, 2016 ... Tickling, then, induces a “primitive form of joy” in animals, said .... step for monkeys is a giant leap toward helping paralyzed people walk again.

scienceline.ucsb.edu/getkey.php?key=467

Scientists suggest that being ticklish is our defense against creepy crawlies like spiders and bugs, a physiological response alerting us to a specific type of threat  ...

www.everydayhealth.com/healthy-living-pictures/tickle-me-pink-12-fun-facts-about-tickling.aspx

Jul 19, 2011 ... Can you really be tickled to death? Who likes being tickled more — men or women? Where are people most ticklish? Here's everything you ...

www.reddit.com/r/explainlikeimfive/comments/1y25zb/eli5_why_are_some_people_ticklish_and_others_not

Feb 16, 2014 ... So probably the main reason some people are less ticklish is that they are older, genetically they start with a smaller tickle response, and/or ...